With the following linear programming problem;

Maximize $$3$x $+$ $$15$y

subject to $2$x $+4$y $<12$

$5$x $+2$y $<10$

x$,$ y $>=0$

Maximize $$3$x $+$ $$15$y is this linear programming problem's

x and y are this linear programming problem's

subject to $2$x $+4$y $<12$

$5$x $+2$y $<10$

x$,$ y $>=0$ is this linear programming problem's